I recently saw some publicity material concerning Gregg Olsen and his "page-turning thrillers." Let me assure you that such a description is not an exaggeration. Olsen has written a number of what I would call "serial-thriller" novels over the past several years, dealing with the bloody deeds of extremely frightening people whose capacity for violence is exceeded only by their cleverness. So it's interesting that CLOSER THAN BLOOD is just a bit different for Olsen. The violence is toned down a shade, and the killer is not hunting random victims. What we have instead is a cat-and-mouse hunt for an individu